John c



(No Model.) J. C. KNIGHT.

GARE-0N HOLDER.

No. 543,186. Patented July 23, 1895.

INVEf/TOR v :Zn ma A rronwn Q UNITED STATES I PATENT OF ICE.

JOHN o. KNIGHT, OF NEW YORK, N. Y.-

CARBON-HOLDER.

SPECIFICATION forming part of Letters Patent No. 543,186, dated July 23, 1895.

Application filed January 15, 1895. Serial No. 535,023- (No model.)

To aZZ whom it may concern.-

Be it known that I, JOHN C. KNIGHT,aciti zen of the United States,and a resident of New York, in the county of New York and State of New York, have invented a certain new and useful Improved Carbon-Holder, of which the following is a specification.

My invention relates to that class of devices commonly known as carbon-holders for clamping or securing in place the carbons in anelectric-arc lamp.

The object of the invention is to provide a simple, cheap, and effective carbon-holder adapted to clamp carbons of various diameter and form good contact with the same, no matter what the size, as well as to accurately center the carbon in its holder in alignment with the opposite carbon.

' The invention consists in the construction and combination of parts, as hereinafter'fully described, and set forthin the claim.

In the drawings which accompany this application and form a part thereof, Figure 1 represents a 'plan of my improved carbonholder. Fig. 2 represents a side elevation thereof. Fig. 3 represents a vertical central section. Fig. 4 represents in plan a modified form.

A designates the body portion'of the holder, which is provided at its upper end with a socket for receiving thecarbon and at its lower end with any suitable means for securing it to the frameof the lamp or to a carbon-carrier such means in this instance being a screw-threaded aperture B, which may receive a threaded -stud upon said frame orv on the end of the carbon-carrier. Through the walls of the socket are passed the clamping means, which may consist of three screws, 0, G, and D, turning in suitable screw-threaded bosses and bearing radially upon the carbon,

thus causing them to converge toward the center of the socket. Two of said screws I have shown as provided with nicks and the third one D as provided with a thumb-piece. This of course is a matter of choice, but for simplicity and economy of manufacture this form is deemed to be the preferable one. The screws might all be provided with thumbpieces or all provided with nicks, but when the screws have been set for a certain size of carbon it will only be necessary to operate carbon-carriers through some accident or in consequence of the wearing of parts get out of alignment. It will be noted also that the socketis shown provided with bosses for receiving the screws. Instead of providing these bosses the wali of the socket may obviously be made sufiiciently thick to properly hold the screws, the screws being placed at an angle of one hundred and twenty degrees apart.

In the place of screws 0 O, I may use other individually-adjustable devices-as, for instance, rods 0 (3 passed through bearingsin the wall of socket A, as seen in Fig. 4, and retained in any desired position by means of the set'screws 0c or. In connection with these rods I prefer to use the set-screw D. .Obviously it may be replaced by a third rod and set-screw.

The faces of the clamping devices are of considerable area, so as to provide extended contact-surfaces.

By the arrangement of the clamping devices about the socket at an angle of one hundred and twenty degrees, the screws CC or rods- C 0 being once set, a new carbon is readily brought into alignment by being forced into the angle between the ends of theor dust may be easily discharged.

The holder, as above described, provided with the screw-threaded opening, can be readily attached to the frames and rods of most of the arc lamps now in use but to adapt said holder to other lamps the means forsecuring cated on the walls of the socket at one hun- IO dred and twenty degrees apart two of which I screws are adapted to be set for a particular size of carbon while the third is in the form of a thumb-screw for frequent manipulation.

Signed at New York; in the county of New York and State of New York, this 14th day I5 of January, A. D. 1895.

JOHN WVitnesses:

WM. H. CAPEL, HENRY T. HIRSCHY.

o.- KNIGHT. 

